I highly recommend NEVER listening to Cesar Millan unless you want an aggressive, fearful dog.

Instead, follow Ian Dunbar, Tamar Geller, kikopup on Youtube or any of the other *positive* trainers with stellar reputations and up-to-date techniques. Cesar is almost criminal in the damage he has done. Google it.

Mouthy Puppy... Give them something else to chew on, a tug, a kong, a toy, a treat. If they insist on biting you, push them away and tell them no. Young puppies need to chew, so make sure they have plenty of toys with different textures (hard, soft, rubber, cloth, bones, ropes, etc). With bully types, make sure you supervise until you're sure they aren't going to destroy the toy. Kong type toys and certain treats (giant dog biscuts) are best if you plan on leaving them alone.